Distribution & abundance of the harbour porpoise & other small cetaceans in the North Sea & adjacent waters : LIFE 92-2/UK/027 : final report /
Hammond, P. S.
Natural Environment Research Council.Sea Mammal Research Unit.
Commission of the European Communities.Directorate-General for Environment, Nuclear Safety and Civil Protection.LIFE Programme.
Cambridge : Sea Mammal Research Unit,
1995.
Includes bibliographical references
Cetacea
Porpoises.